Corner construction for marginally flanged paperboard container covers



July 15, 1952 w. c. GEORGE 2,603,406

CORNER CONSTRUCTION FOR MARGINALLY FLANGED PAPERBOARD CONTAINER COVERS Filed Oct. 14, 1949 INVENTORZ w yam am/w ms 'ATToRfiEYs.

Patented July 15, 1952 CORNER, CONSTRUCTION"FORMARGINALLY- FLANGED PAPIERBOARD' CONTAINER COVERS was; 0. Grgast Louis; Mo; assign1r tP-Gayi lord Container Corporation, St. Louis, 'Mo., a, corporation of'Maryland f Application October 14, 1949, satin No. 121,2 7 6 Q 7 '7 Claims; (craze-+497.

: ,This invention relates tocorner constructions I for containers, particularly corner constructions forhinged, marginally flanged, paperboard container covers of the kind shown in Fallert Patents Nos. 2,022,191 and 2,089,694 and Williams Patent No.; 2 ,;1 2 4,326,wherein the cover panel has a depending free side marginal flange with :a lower .niarginal flap, which is folded, upwardly along the .inner side face of said flange, andafldepending end flange that terminates at "its outer endin a right-angularly bent tonguefthatextends and is secured between the depending side flange and the upturned lower 'marginalflap thereof; d Theobject of the present invention is to provide-a strong and rigid, simple and economical, flanged 'cover corner construction of the ab'iove type which will permit the end tab of the depending end flange of the cover to bequickly and easily inserted between the adjacent end portions of the depending side marginal cover flange and the upwardly folded lower marginal flap thereof.

1 The invention consists in the flanged paperboard cover corner construction and in the parts and combinations and arrangements of parts hereinafter describedv and claimed.

In the accompanying drawings, which form 7 part of the specification and whereinlike symbols refer to like parts wherever they occur:

Fig. 1 is a fragmentary plan view of a'iblank from which a flanged cover corner construction embodying my invention'is made," 7

Fig. 2 is'an end elevational view of acontainer provided with hinged cover construction embodying my invention,

Y Fig. 3 is an end vertical cross-sectional view through-the container, v

Fig. 4 is a plan view of one of the corner porti'ons 'of' the cover blank, P

i Fig. 5 is a view similar to Fig. 4, showing the free marginal flap of the side marginal flange of the cover panel blank folded upon and ad- ;hesively secured to. said flange, i

Figs. 6 and 7 arefragmentary perspective views of the corner portion of the cover panel, showing ,the manner of inserting the locking tongue between the adjacent separated end portions of the side flange and its folded over free marginal flap; and r Fig. 8 is a view similar toFig. 6, showing a modified corner construction. v In the accompanying drawingsymy invention is shown embodied-infa-folded-blank paperboard 'container comprising side walls I with hinged thereof that ar each provided witha depending free side marginalflange 3 ;having a lower-marginalflap 4 which is folded upwardly along the inner side face thereof and. with depending. end flanges 5, each terminating at its outerend in a tongue iigwhich is bent at. right angles and extends between saidfree side marginal flange and the upturned marginal flapithereoL' 'IThe container is also provided with end wallpanel's I having flaps 8' that are bent inwardly and downwardly y from the upper edge thereof,,said folded JIDDEI' edges being notched, as at}, to accommodate the adjacent end portionsbfthe foldeddepnding side flanges ,3 'of therhalf-cover I panels]. H V. z' A QShOWILiIl Fig.1, eachhalfcover" panel 2 is preferably made from a'blank of relatively thick stiff fiberboard provided with a wide longitudinal score [0 along which the side flange is bent, a wide longitudinal reverse score I I along which the marginal flap 4 of said side flange is bent, and 'a'wide transverse score l2 located adjacent to each end of said blank and along which the end flan'ge5 at said end is bent. The vvside flange forming-margin of the blank'isp'rovided adjacent to each end' with a notchv I3- that extends inwardly along the transverse score'IZ to the longitudinal score I0 and separates theend ongues of the end flange 5 from thesidelflange 3, the longitudinal score I0 extending across said tongue, as at Illa, and m'arking off the line'on whichf-s'aid tongue is bent.

Theffolded-blank container thus'far described is'lshown in the above prior patents wherein" the forming .of the flanged cover corner construction .requires the slow and difficult finger tiring operations of first bending the end flanges 5 and the end tongues 6 thereof into positionand then holding said tongues in such position by folding the side flange 3 against one side of said tongue and the marginalflap 4 of said side'flangeover said tongue and against the other side thereof andthen holding the stiff folded parts in folded position until they are stapledtogether.

'In accordance with the present invention,= 'th'e cover panel blank is provided adjacent 'to each end with a longitudinal-notch 14 which extends inwardly from the-end of the side flange panel 3 alongthe wide longitudinal score I l, which defines the marginal flap 4 of said side flange panel, for

half-cover panels 2 along the upper margins flanged corner cover is formed by first folding. the

3 7 side marginalflap 4 over upon the side marginal flange 3 and adhesively or otherwise permanently securing said flap flatwise to said flange inward- 1y of the notch l4 located at the end of said flange along the wide longitudinal score I I along which s aiddnarginal flap is folded, thereby leaving the'end portions of said side flange and said marginal flap free of one another on opposite sides of said notch and leaving the space between said" end portions of said side flange andflap open,

along their outer side margins a's well as at. ,1

7 their ends.

The folded and glued side marginal flange 3 is then bent at right angles'to the cover panel 2. Y

At the same time, the end flange 5 of th' cover panel 2 is bent atright angles thereto while the tongue 6 at the end of'said end flange is bent at an; angle thereto and swung between the sepafoldedmarginal flap 4 through the spaces between the ends andlongitudinal side edges'of said-portions; said tongue 'reaching its final p'osi-' ti on in the' fully erected positions of the end flanges and the pre-f olded side marginal flange of the c over panel. Inthis position of the parts, the end tongue 6 of the end flang'eS extends between theend portions of the side flange Sand itsfoldedmarginalflap 4 for the full length oi the notch [4 that separates'said end portions and is disposed with itslow'e'r edge flush with the lower edgesfofs'aid-portionsan'd with its'upper edge abutting against'th'e underside t me cover, 'p'anel 2;' With fthe partsin this --position, the tongue 6 is secured in place betweenthe separated-end portions of the side flange 3 and its upturned H I p flby staples Her other suitable'fasteningrneans; Y

2. In a container having a cover with two angularly disposed corner forming margins, said cover bein provided along one'of said margins with a depending'flange having a lower marginal flap folded upwardly along the inner side thereof and; along" the other of 'sa id "margins jwith a depending flange having an inwardlybent end tongue extending between said first mentioned flange and the upwardly folded lower marginal flap-thereof, said tongue being of a length substantially greatertlian the width of said depending marginal flange, the improvement which consists in providing said tongue receiving end por- 1 tionofsaid first mentioned flange with a slot ex- ]tendi'rjig' along the folded lower edge thereof through which said tongue is passed to position it between said first mentioned flange and its 7 rated end portions of the side flange 3 and its In themodifi'ed corner construction shown in Fig. 8, the free end portion of the flaps'4 of the folded sidemarginal flange 3 of the cover may :be coped offor beveled, as at 4a along the notch M sc that thetongue 6 of the end flange 5 is automatically piloted into said notch by'placing isaid tongue against the exposed inner face of the turner-portion of said side marginal flange.

Thehereinbefore described improved flanged cover corner construction 'is simple and economic al and strong and durable; it permits the flap 4 ,oi. thfe side flange 3, to be folded into position be- ,iorejferection offs'aid flange and the end' flanges 5'} it enables'the operator to quickly and easily swing the ,loching tongues 6' into. positionibetween thespaced end portion ofjthe side flange and pre-folded'jflap thereof during the simultaneous erectionpf 'the-end and folded side ,flanges; and .it enablesthe folded andinterl'ocked parts to be easily held'iin position'for stapling.

avhatjic aimis: l. Ina c ntainerhavinga cover with twoangul'arly disposed corner forming margins, said cover {being provided along: onefof said margins with a dependingjsflange havingfa lower marginal flap foldedupwardly alongone side thereof and along the other of'said margins 'witha depending flange having an inwardly bent end tongue extending between said first mentioned flange and theupwardly folded lower marginalflap. thereof, said tongue being of a length at least equal to the width of said depending flange, the-improvement which'consists in providing said tongue receiving.

portion of said first mentioned flange with an opening along the folded lower edge thereof through which said tongueispassedto positionit between said first mentioned flange and its folded flap. 7

folded flap.

3. A 'cover blank for a'container comprising a panel having two angularly disposed corner forming edges; said panelbeing scored along one of its margins to provide aflange "'With-afree side marginal flap, said flange having a notch extending 'inw ardly irom the end thereof along the'flap fining score; said flap being folded upon said flange to bringsaid notch-along the folded edge thereof and said flap 'beingsecured to s'alid'flrst mentioned flange inwardlyof {said notch anld-being left free on opposite sides thereof, and a' score folded upon said ,flrst mentioned flange tobring said notch along the folded edge thereof and said flap being adhesively secure'd ',to said first mentioned flange inwardly ofsaid notch and being "left free for the fulliehg'tli' thereof, and a'sc'ore tongueJi, 7 5. Thecornbin'ation set forthin claim 4 whereextendingfalof the othermai'gin of said panel and forming aflange therealong havingafreeend in said notch i's'. ,;heveled along the sidefthere'of nearestsaid flapgsoithatlthe inner face of the pute feorner portion of'said first mentioned flange is exposed'wh'en' said flap wielded/thereupon. 1 6. In acontainer having a cover with two angularly disposed corner formingmargins, said coveribeing provided along oneof saidmargins,

with a depending flange having. a lower. marginal flap folded upwardly along' the inner side thereof ,and along the other of said margins with a depending flange having an inwardly bent end tongue extending between said first mentioned flange and the upwardly; folded" lower marginal flap thereof, said tongue hein g ofa lengthsu-b- 'stantially'greaterthan the width'of said depending marginal fla ge; the improvement which consists in providing said tongue'receiving endportion of said firstmentioned flange with a slotextending along thenfolde'df lower .edge thereof through which saiditong'ueiis passed to position it between said'firstImentioned'flange andv its folded flap, said n points-pr said first menti oned flange extendingfbeyond; the corresponding end portion of its folded flap so as to provide a pilot portion for said tongue.

7. In a container having a cover with two angularly disposed corner forming margins, said cover being provided along one of said margins with a depending flange having a lower marginal flap folded upwardly along the inner side thereof and along the other of said margins with a depending flange having an inwardly bent end tongue extending between said first mentioned flange and the upwardly folded lower marginal flap thereof, said tongue being of a length substantially greater than the Width of said depending marginal flange, the improvement which consists in providing said tongue receiving end portion of said first mentioned flange with a slot extending along the folded lower edge thereof REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 707,073 Beers Aug. 19, 1902 2,005,131 De Luce June 18, 1935 

